[go: up one dir, main page]

US4556192A - Butterfly valve with servo-motor - Google Patents

Butterfly valve with servo-motor Download PDF

Info

Publication number
US4556192A
US4556192A US06/647,633 US64763384A US4556192A US 4556192 A US4556192 A US 4556192A US 64763384 A US64763384 A US 64763384A US 4556192 A US4556192 A US 4556192A
Authority
US
United States
Prior art keywords
butterfly valve
spring
butterfly
shaft
recited
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/647,633
Other languages
English (en)
Inventor
Jan Ramisch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom SA
Original Assignee
BBC Brown Boveri AG Switzerland
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Assigned to BBC BROWN, BOVERI & COMPANY LIMITED reassignment BBC BROWN, BOVERI & COMPANY LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RAMISCH, JAN
Application granted granted Critical
Publication of US4556192A publication Critical patent/US4556192A/en
Assigned to ABB PARTICIPATION AG reassignment ABB PARTICIPATION AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BBC BROWN BOVERI AG
Assigned to BBC BROWN BOVERI AG reassignment BBC BROWN BOVERI AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BBC BROWN, BOVERI & COMPANY LIMITED
Assigned to ALSTOM reassignment ALSTOM ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABB PARTICIPATION AG
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/221—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves specially adapted operating means therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
    • F16K31/163—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
    • F16K31/163—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston
    • F16K31/1635—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston for rotating valves

Definitions

  • the present invention concerns a butterfly valve actuated by a servo-motor in which opening takes place by means of hydraulic force and closing takes place by means of spring force.
  • Butterfly valves such as are used, for example, in the low-pressure region of steam turbines, are actuated by a servo-motor, with opening taking place by means of hydraulic force and closing by means of spring force.
  • An open central butterfly valve with symmetrical wings is free from torque.
  • the closing spring has the task of setting the butterfly into motion from the neutral open position, i.e., of accelerating the mass of the butterfly wings and all the moving parts. If a short closing time is required, and if the mass moment of inertia of the butterfly system is large, the acceleration time can account for a substantial part of the total closing time.
  • the hydraulic force must overcome the torque due to the flow and the force of the closing spring. If a stronger spring is selected in order to decrease the closing time, the hydraulic force and hence the servo-motor must be larger.
  • the invention is intended to provide assistance on this point.
  • the invention has the object of minimising the closing time of the butterfly without having to enlarge the servo-motor.
  • the servo-motor is dimensioned to suit the maximum torque due to the flow, which torque occurs at an opening angle of the butterfly between 30' and 50'. Due to the kinematic relationships at the servo-motor, the hydraulic force also acts at the end position where the valve is open, where it is not in fact required. This excess hydraulic force is stored, in the end position with the butterfly open, so that it can then be used in the initial phase of the closing procedure in order to accelerate the mass of the butterfly. By this means, the acceleration phase is shortened and the closing time minimised, the closure shortening effect increasing with increasing mass moment of inertia. In the case of heavy butterflies, it can amount to one third of the total closing time.
  • the excess hydraulic servo-motor force is converted into mechanical energy.
  • the mechanical energy is stored in a spring assembly whose location is opposite the drive side of the butterfly.
  • FIG. 1 shows a complete butterfly valve in the open position
  • FIG. 2 shows the movement transmission between the servo-motor and the butterfly wings along the line II--II in FIG. 1;
  • FIG. 3 shows the location of the spring accumulator viewed in the direction III in FIG. 1;
  • FIG. 4 shows the construction of a spring accumulator
  • FIG. 5 shows the closing procedure of a butterfly valve without spring accumulator, plotted against time
  • FIG. 6 shows the closing procedure of a butterfly valve with spring accumulator, plotted against time.
  • FIG. 1 shows the arrangement of a complete butterfly valve 1 in the open position.
  • the shafts 11a and 11b attached to the butterfly wings 1a are supported in a butterfly valve casing 4.
  • the two fork-shaped arms 7, which provide the anchoring 8 of the servo-motor 2 are solidly connected to the butterfly valve casing 4 at the drive-side butterfly bearing 5a.
  • the partially visible piston rod 6 is connected to the shaft 11a.
  • the spring accumulator side 3a, with the spring accumulator 3, is on the opposite side from the drive side 2a.
  • the spring accumulator is similarly solidly connected to the butterfly valve casing 4 at the spring-accumulator-side butterfly bearing 5b.
  • the transmission of movement between the butterfly wings drive-side shaft 11a and the piston rod 6 is provided by the crank 12.
  • the hydraulic force 9 opens the butterfly wings 1a and simultaneously compresses the plate spring column 10, which is then responsible for the closing procedure.
  • FIG. 3 shows the location of the spring accumulator 3 on the spring-accumulator-side butterfly bearing 5b.
  • FIG. 4 shows the construction of the spring accumulator 3. It is solidly connected to the butterfly valve casing 4 by means of screws 17 and nuts 18.
  • the cam disc 13 solidly connected to the shaft 11b presses, in the direction of rotation 1c, on the rod 14 of the spring accumulator 3.
  • the collar 14a compresses the plate spring column 15.
  • the spring force of the compressed plate spring column 15 is then available, in addition to the already compressed plate spring column 10 of the servo-motor 2, during the closing procedure.
  • FIG. 5 and FIG. 6 show a comparison between rapid closure without energy accumulator (FIG. 5) and with energy accumulator (FIG. 6).
  • the gain in closing time, t 1 -t 2 between the completely open position (90°) of the butterfly wings 1a and the position with the valve closed down to 20°, for a moderately heavy butterfly valve 1 with a spring accumulator 3, is up to 17% of the closing time of a similar butterfly valve without a spring accumulator.
  • the gain in closing time amounts to as much as 33%.

Landscapes

  • General Engineering & Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)
  • Lift Valve (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Body Structure For Vehicles (AREA)
  • Vehicle Body Suspensions (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Seats For Vehicles (AREA)
  • Devices For Opening Bottles Or Cans (AREA)
  • Toys (AREA)
  • Automatic Disk Changers (AREA)
  • Control Of Water Turbines (AREA)
  • Fluid-Damping Devices (AREA)
  • Magnetically Actuated Valves (AREA)
  • Lock And Its Accessories (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Actuator (AREA)
US06/647,633 1983-09-30 1984-09-06 Butterfly valve with servo-motor Expired - Lifetime US4556192A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH532183 1983-09-30
CH5321/83 1983-09-30

Publications (1)

Publication Number Publication Date
US4556192A true US4556192A (en) 1985-12-03

Family

ID=4291619

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/647,633 Expired - Lifetime US4556192A (en) 1983-09-30 1984-09-06 Butterfly valve with servo-motor

Country Status (16)

Country Link
US (1) US4556192A (de)
EP (1) EP0143910B1 (de)
JP (1) JPS6095286A (de)
KR (1) KR890000071B1 (de)
AT (1) ATE36390T1 (de)
CA (1) CA1246521A (de)
CS (1) CS264321B2 (de)
DE (1) DE3473331D1 (de)
DK (1) DK159981C (de)
ES (1) ES8506877A1 (de)
HU (1) HU195293B (de)
IN (1) IN162393B (de)
MX (1) MX161588A (de)
PL (1) PL146704B1 (de)
PT (1) PT79283B (de)
YU (1) YU45208B (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738190A (en) * 1986-04-11 1988-04-19 Sheu Muh Chuan Fan casing with cover
US4962783A (en) * 1989-10-16 1990-10-16 Allied-Signal Inc. Butterfly valve apparatus and method
US4964431A (en) * 1989-10-16 1990-10-23 Allied-Signal Inc. Butterfly valve apparatus and method
US4964422A (en) * 1989-08-17 1990-10-23 Allied-Signal Inc. Butterfly-type check valve
US4967778A (en) * 1989-10-16 1990-11-06 Allied-Signal Inc. Butterfly valve apparatus and method
US4967997A (en) * 1989-10-24 1990-11-06 Allied-Signal Inc. Butterfly valve with intra-shaft actuator means
US4969485A (en) * 1989-10-16 1990-11-13 Allied-Signal Inc. Butterfly valve apparatus and method
US4995414A (en) * 1990-06-06 1991-02-26 Allied-Signal Inc. Butterfly valve method and apparatus
US5000212A (en) * 1990-06-15 1991-03-19 Allied-Signal Inc. Butterfly valve method and apparatus employing variably positionable pivot shaft
US5000213A (en) * 1989-06-30 1991-03-19 Allied-Signal Inc. Butterfly valve method and apparatus
US5005804A (en) * 1990-06-06 1991-04-09 Allied-Signal Inc. Balanced-torque butterfly valve
US5067506A (en) * 1989-06-30 1991-11-26 Allied-Signal Inc. Flight craft with fluid systems which incorporate butterfly valves, and butterfly valve methods and apparatus
US5195719A (en) * 1989-06-30 1993-03-23 Allied-Signal Inc. Butterfly valves with actuators carried on valve plate
US5213306A (en) * 1988-12-23 1993-05-25 Asea Brown Boveri Ltd. Quick-action flap
US6083103A (en) * 1998-02-25 2000-07-04 New Holland North America, Inc. Sensor apparatus with butterfly valve for maintaining packing density of moving material
US6216737B1 (en) 2000-05-05 2001-04-17 Nibco Inc. Flanged three-way universal butterfly valve
FR2820185A1 (fr) * 2001-01-30 2002-08-02 Ksb Sa Robinet quart de tour a dispositif anti-battement
US20030221725A1 (en) * 2002-05-29 2003-12-04 Richard Greco Regenerative oxidizers with elliptical valve system
US20050005919A1 (en) * 2003-07-08 2005-01-13 Tyler Jeffery A. Control system regulating air flow to engine intake
US20090139229A1 (en) * 2006-06-21 2009-06-04 Gerolf Frantzheld Exhaust manifold
US20110113775A1 (en) * 2008-07-10 2011-05-19 Lilly Daryl A Valve actuator for turbocharger systems
ES2945634A1 (es) * 2022-06-01 2023-07-05 Ind Metalcaucho S L Procedimiento, dispositivo y producto de programa informático para la verificación de válvulas

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8529444D0 (en) * 1985-11-29 1986-01-08 Coal Industry Patents Ltd Dampers
JP4907509B2 (ja) * 2007-12-05 2012-03-28 新日鉄エンジニアリング株式会社 シリンダー駆動による回転駆動装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054156A (en) * 1975-02-24 1977-10-18 The Weatherhead Company Exhaust brake valve
US4158367A (en) * 1976-04-12 1979-06-19 S.A. Des Anciens Etablissements Paul Wurth Valve system and improved actuator therefor
US4261546A (en) * 1980-06-25 1981-04-14 Posi-Seal International, Inc. Quarter-turn valve actuator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3642024A (en) * 1970-03-09 1972-02-15 Westinghouse Electric Corp Butterfly valve
US3771759A (en) * 1972-04-05 1973-11-13 Chandler Evans Inc Butterfly valve
FR2304957A1 (fr) * 1975-03-17 1976-10-15 Amri Actionneur commandable a distance et revenant a sa position initiale des qu'il cesse d'etre sollicite
US4211263A (en) * 1978-10-16 1980-07-08 Velasco Scale Company Dual fill rate liquid filler apparatus having a single control valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054156A (en) * 1975-02-24 1977-10-18 The Weatherhead Company Exhaust brake valve
US4158367A (en) * 1976-04-12 1979-06-19 S.A. Des Anciens Etablissements Paul Wurth Valve system and improved actuator therefor
US4261546A (en) * 1980-06-25 1981-04-14 Posi-Seal International, Inc. Quarter-turn valve actuator

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738190A (en) * 1986-04-11 1988-04-19 Sheu Muh Chuan Fan casing with cover
US5213306A (en) * 1988-12-23 1993-05-25 Asea Brown Boveri Ltd. Quick-action flap
US5195719A (en) * 1989-06-30 1993-03-23 Allied-Signal Inc. Butterfly valves with actuators carried on valve plate
US5067506A (en) * 1989-06-30 1991-11-26 Allied-Signal Inc. Flight craft with fluid systems which incorporate butterfly valves, and butterfly valve methods and apparatus
US5000213A (en) * 1989-06-30 1991-03-19 Allied-Signal Inc. Butterfly valve method and apparatus
US4964422A (en) * 1989-08-17 1990-10-23 Allied-Signal Inc. Butterfly-type check valve
US4969485A (en) * 1989-10-16 1990-11-13 Allied-Signal Inc. Butterfly valve apparatus and method
US4967778A (en) * 1989-10-16 1990-11-06 Allied-Signal Inc. Butterfly valve apparatus and method
US4964431A (en) * 1989-10-16 1990-10-23 Allied-Signal Inc. Butterfly valve apparatus and method
US4962783A (en) * 1989-10-16 1990-10-16 Allied-Signal Inc. Butterfly valve apparatus and method
US4967997A (en) * 1989-10-24 1990-11-06 Allied-Signal Inc. Butterfly valve with intra-shaft actuator means
US4995414A (en) * 1990-06-06 1991-02-26 Allied-Signal Inc. Butterfly valve method and apparatus
US5005804A (en) * 1990-06-06 1991-04-09 Allied-Signal Inc. Balanced-torque butterfly valve
US5000212A (en) * 1990-06-15 1991-03-19 Allied-Signal Inc. Butterfly valve method and apparatus employing variably positionable pivot shaft
US6083103A (en) * 1998-02-25 2000-07-04 New Holland North America, Inc. Sensor apparatus with butterfly valve for maintaining packing density of moving material
US6216737B1 (en) 2000-05-05 2001-04-17 Nibco Inc. Flanged three-way universal butterfly valve
FR2820185A1 (fr) * 2001-01-30 2002-08-02 Ksb Sa Robinet quart de tour a dispositif anti-battement
WO2002061310A1 (fr) * 2001-01-30 2002-08-08 Ksb S.A.S. Robinet avec amortisseur
US20030221725A1 (en) * 2002-05-29 2003-12-04 Richard Greco Regenerative oxidizers with elliptical valve system
US20050005919A1 (en) * 2003-07-08 2005-01-13 Tyler Jeffery A. Control system regulating air flow to engine intake
US6883320B2 (en) * 2003-07-08 2005-04-26 G. W. Lisk Company, Inc. Control system regulating air flow to engine intake
US20090139229A1 (en) * 2006-06-21 2009-06-04 Gerolf Frantzheld Exhaust manifold
US8166754B2 (en) * 2006-06-21 2012-05-01 Daimler Ag Exhaust manifold
US20110113775A1 (en) * 2008-07-10 2011-05-19 Lilly Daryl A Valve actuator for turbocharger systems
ES2945634A1 (es) * 2022-06-01 2023-07-05 Ind Metalcaucho S L Procedimiento, dispositivo y producto de programa informático para la verificación de válvulas

Also Published As

Publication number Publication date
DE3473331D1 (en) 1988-09-15
DK159981C (da) 1991-06-03
HU195293B (en) 1988-04-28
YU45208B (en) 1992-05-28
HUT40716A (en) 1987-01-28
CA1246521A (en) 1988-12-13
YU167684A (en) 1988-10-31
KR890000071B1 (ko) 1989-03-07
KR850002888A (ko) 1985-05-20
DK455184D0 (da) 1984-09-24
ES536378A0 (es) 1985-08-01
DK159981B (da) 1991-01-07
ATE36390T1 (de) 1988-08-15
EP0143910A1 (de) 1985-06-12
EP0143910B1 (de) 1988-08-10
JPH0454112B2 (de) 1992-08-28
CS713984A2 (en) 1988-12-15
DK455184A (da) 1985-03-31
ES8506877A1 (es) 1985-08-01
CS264321B2 (en) 1989-07-12
MX161588A (es) 1990-11-13
PT79283A (de) 1984-10-01
IN162393B (de) 1988-05-21
PL146704B1 (en) 1989-03-31
PL249794A1 (en) 1985-05-07
PT79283B (de) 1986-07-17
JPS6095286A (ja) 1985-05-28

Similar Documents

Publication Publication Date Title
US4556192A (en) Butterfly valve with servo-motor
US5187835A (en) Door closer with rack and pinion, spring, and spring mounting plate
EP0409445B1 (de) Türschliesser
KR100191338B1 (ko) 위생 피팅
CA2002747A1 (en) Gate valve with supplemental actuator
NO121123B (de)
US4265141A (en) Mechanical force multiplier
SU936825A3 (ru) Устройство дл регулировани производительности компрессора
EP0545624A2 (de) Fussbodentürschliesser
GB2107393A (en) I.C. engine with a fluid pressure valve operating system
KR910700392A (ko) 다기통 자기시동 단류 엔진
SU830065A1 (ru) Запорное устройство
US4186613A (en) Mechanical movement
JPS6214461Y2 (de)
JPS627437B2 (de)
US18925A (en) Giving- motion to valves of steam-engines
CN217482109U (zh) 电液控制执行器
RU1810703C (ru) Привод запорной арматуры
JPS621426Y2 (de)
SU1176056A1 (ru) Запирающее устройство
SU396521A1 (ru) Клапан
US21295A (en) Photo-litho
US10185A (en) Regulating the speed of steam-ehg-ijstesi
JP3372293B2 (ja) ポンプ翼の可変装置
JPS6443684A (en) Auto-hinge for door

Legal Events

Date Code Title Description
AS Assignment

Owner name: BBC BROWN, BOVERI & COMPANY LIMITED, CH-5401 BADEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RAMISCH, JAN;REEL/FRAME:004452/0035

Effective date: 19840821

STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12

AS Assignment

Owner name: ABB PARTICIPATION AG, SWITZERLAND

Free format text: CHANGE OF NAME;ASSIGNOR:BBC BROWN BOVERI AG;REEL/FRAME:012252/0242

Effective date: 19990318

Owner name: BBC BROWN BOVERI AG, SWITZERLAND

Free format text: CHANGE OF NAME;ASSIGNOR:BBC BROWN, BOVERI & COMPANY LIMITED;REEL/FRAME:012252/0305

Effective date: 19900918

AS Assignment

Owner name: ALSTOM, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ABB PARTICIPATION AG;REEL/FRAME:012506/0124

Effective date: 20010712